Spray gun



FIG. 1 is a right view showing my new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a left view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a perspective view thereof.

The broken lines shown on the drawings are for the purpose of illustration and form no part of the claimed design. 

CLAIM The ornamental design for a spray gun, as shown and described. 